3 Answers

These GM transmissions are fussy about having the fluid
changed. Most dealers won't do it at 100,000 miles if it's
never been changed before or if it's history is unknown.
Most likely there's worn parts in there that were using the
"crud" in the old fluid to grab onto and work correctly.
Since the fluid is clean now it's causing issues. You're
probably looking at a tranny rebuild. HTH. -Jim

Anyone else have trouble with this car just stopping in the middle of the road. I've had this for about 5
years, I average under 100 per week, local driving. In the spring it started randomly honkin...